03-03-2012, 04:45 PM | #67 | |
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N55 pipe = 258.1 the difference is 12.1 I dont think you can use the 242 figure since that was with M off, right? |
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03-03-2012, 04:50 PM | #68 |
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Correct, thank you Papethova
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03-03-2012, 05:04 PM | #69 |
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All the scrutiny of Zuzu's results aside, even if it produced half the HP gain in terms of bang-for-the-buck you can't go wrong.
Zuzu - thanks for posting your data - much appreciated. My mid-pipe is on order. |
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03-03-2012, 06:25 PM | #70 | ||
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03-03-2012, 09:26 PM | #71 | |
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1. I have dynoed the car with M button on, and with it off (in consecutive runs). No change in observed peak HP numbers. 2. I have a boost gauge (get's physical readings through DV lines as opposed to the CANbus version). No observed difference in peak boost between M and non-M mode (15psi peak on stock tune regardless if M button is engaged). 3. I have also logged the car in multiple parameters, peak included, through the AccessPort. Again no difference in peak boost was noticed whether M button was activated or not (via ECU readings this time). 4. Tuners like COBB have maps which disable the M button all-together (e.g. their 91 and 93 Linear Throttle maps where there is no difference if you depress the M button or not). This results in no change in recorded peak power as compared to there Non-Linear Throttle maps (where the M button is allowed to work). All it changes is sensitivity on throttle response, not peak power (nor boost). 5. I dynoed my MadDad mid pipe + Akra Slip-On and got a 10whp delta gain. Compared to the N55 mids, the MadDad is no less restrictive, in fact I'd venture to guess to say it is even freer flowing. Unless one can argue the Akra Slip-On (valves fully open) exhaust is more restrictive than stock (close to an impossibility), getting the alleged gains from an N55 mid pipe alone certainly look very optimistic. FWIW, I had the MadDad midpipe on my 135i and it recorded 8whp gains. At the end of the day, I personally don't think the M button is any different than what I had on my E39 M5 (basically a factory-installed Sprintbooster that changes throttle response). What has documented here is definitely in contradiction, so I too would like to know what occurring.
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03-03-2012, 10:39 PM | #72 |
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stock engine and ecu. Only changed midpipe to n55. Overal sound is little louder. Drone is almost not there maybe a little bit.
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03-03-2012, 11:00 PM | #73 |
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Sorry for getting off topic. The easiest way to determine if your exhaust is droning, simply drive with your rear seats down. I stumbled onto this when I was transporting my track wheels last weekend.
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03-04-2012, 06:43 AM | #74 |
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Hi guys, and special thanks to Mr Zuzu for his time, money spent and most importantly for his patience. While a 16hp is quite an impressive gain for such a relatively small mod, it confirms that there's definitely a power gain, together with a bit more sound. Now why it is a bit more than expected could be down to:
1: more milage 2: type and temperature of fuel 3: running-in oil Vs normal oil As for the M button, most tuners seem to agree it has a negilgible effect on the curves, so what could explain the difference here could be the following. Zuzu explained us that his car made a bit more power after each run, which is unusual. But we know also that the ECU is progressively adapting to fuel quality. So if the last fill up was better than the previous, it would explain why the 1st run (M off) and then subsequent runs (M on) showed increasing numbers. In this case the increase would reflect ECU adaptation, and not M button position. German/swiss tuners are known to measure their cars with 100 to 102 octane gas, so it certainly makes a difference. There was also an article in EVO on the subject, where they used a Golf 5 GTI to rate the different fuels available in the UK, with significant differences. But anyway, back to this post: the mid-pipe is in my view the single most interesting modification for the 1M. Thanks again, Zuzu ! |
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03-04-2012, 08:05 AM | #75 | |
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From what others also commented, like Advevo's input, the gains are not limited to a slight (or not) increase in power/torque, it enhances the sound, it cures the drone (partially or more), it gives better throttle response, it makes the engine more free reving at the top of the band where it needs it, is OEM part which fits just like a glove and costs more or less the same of a rear spoiler. Well, I am sold. Zuzu, thanks for all the time and patience. |
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03-04-2012, 08:07 AM | #76 |
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03-05-2012, 01:06 AM | #77 | |
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03-05-2012, 04:29 AM | #80 |
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The MOT now has vehicle specific emmisions tests, so my guess is no, it won't pass, but it isn't possible to say yet as the 1M emmisions targets for MOT have not been published by the DOT yet. However, this is the easiest part to swap back for MOT if need be, so I wouldn't let it stop you.
Re warranty, well, a clued up tech would know it isn't the right part, so it being OEM wouldn't ensure no issues, but I wouldn't anticipate any warranty issues from changing an exhaust component in any case...
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03-05-2012, 05:22 AM | #81 |
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Ian even the vehicle specific emmissions tests? Do you know what the target figures will be for the 1M?
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03-05-2012, 07:25 AM | #83 | |
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03-05-2012, 07:45 PM | #88 | |
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FYI - I was quoted the following on my order from http://getbmwparts.com/: Items Total: $333.22 Shipping Method: Standard Ground - US Only Shipping: $24.95 Handling Fee: $3.95 Order Total: $362.12 Now they are telling me it's $75.00 for shipping even though they provided the quote above. Be warned. |
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